The graph shows the total distance, in miles, Keandra traveled from her home over a certain amount of time, in minutes.

graph with the x axis labeled time in minutes and the y axis labeled total distance in miles, with a line segment from 0 comma 0 to 40 comma 100, a horizontal line segment from 40 comma 100 to 80 comma 100, a line segment from 80 comma 100 to 100 comma 125 and a line segment from 100 comma 125 to 120 comma 100

Part A: Identify the interval(s) where the graph is increasing, decreasing, and constant. (2 points)

Part B: Write a detailed description for the graph using information from Part A. (2 points)